Tank truck



9 Shets-Sheet 1 F. A. HOLBY TANK TRUCK Original Filed April 5. 1933 Se t. 20, 1938.

F. A. HOLBY Sept. 20, 1938.

TANK TRUCK 9 Sheets-Sheet 2 Original Filed April I5, 1933 M WN Sept. 20, 1938. A. HOLBY I Re. 20,863

TANK TRUCK Original Filed April 3. I933 -9 Sheets-Sheet 3 Sept. 20, 1938. Re. 20,863

.F. A. HOLBY TANK TRUCK Original Filed April I5, 1953 9 Sheets-Sheet 4 F. A. HOLBY Sept. 20, 1938.

TANK TRUCK 'OriginaI FiledApriI 5. 1933 '9 Sheets-Sheet s F. A. HOLBY TANK TRUCK Sept. 20, .1938.

Original Filed April 3. 1933 9 Sheets-Sheet 6 Sept. 20, 1938. F. A. HOLBY TANK TRUCK Original Filed April 3. 1933 9 Sheets-Sheet 7 F. A. HOLBY TANK TRUCK Sept; 20, 1933,

9 Sheets-Sheet 8 Original Fileg April 3. 1933 F. A. HOLBY TANK TRUCK Sept. '20, 1938.

Original Filed April 3. 1933 I 9 Sheets-Sheet 9 w w u 500K 71 bo/[ay Reissue! 20, 1938 rm muck Frank A. Holby mvcnlde. Com, assignor, by

means assignments, to

The William F. Kenny Company, New York, N. Y.. a corporation of New York Ol'lginal No. 2,037,020, dated ll 14, 1086, Serial No. 664,255, Aprll 3, 1883.

Application for reissue November 2 1937, Serial No. 172,471

28 Claims. (01. 137-21) The present invention relates to tank trucks and has to do particularly withspeciflc features of'tank construction, with means for mounting the tank on a chassis and to a discharge system for the tank.

According to the invention, a positive pump discharge is contemplated, the discharge pump being preferably driven by a hydraulic motor which, in turn,is driven from a source of fluid pressure preferably in the form of a master pump driven by the truck propelling motor. The main tank is preferably divided into a number of tank compartments from any one of which fluid may be withdrawn by the proper adjustment of a selector and control valve, the selector valve controlling pressure responsive devices adapted to connect'the selected tank with a manifold running to the discharge pump, and the control valve being operable to control the supply of pressure fluid to the discharge pump drive motor.-

In addition the invention includes safety provisions whereby dischargeis instantaneously in terrupted upon arising of certain contingencies.

It-rnay be stated briefly that the main purposes of the invention are to provide a construction combining maximum transportation capacity, maximum facilities for quick loading and unloading and the utmost safety and simplicity of op-' eration.

Without further general reference to the features of the invention, I shall proceed to describe, by way of illustration, a practical embodiment thereof, the specific description to be made with 35 reference to the accompanying drawings. In

- these drawings:

Figure 1 is a side elevation with parts broken away to reveal others of a tank truck constructed in accordance with the present invention.

40 Figure 2 is a plan view of the tank with parts broken away. I

Figure 3 is a section substantially on line 3-3 of Figure 2. v

Figure 3a is a section substantially on line 3a--3a of Figure 3.

Figure 4 is a diagram illustrating the tank- Figure 8 is an axial section of a two-way'vent and pressure relief valve.

Figure 9 is a plan view of the valve of Figure 3 with parts broken away.

Figure 10 is an axial section of a combined motor, discharge pump and bypass unit.

Figure 11 is another axial section of the device of Figure 10.

Figure 12 is a plan view of the device of Flg= ure 10.

Figure 13 is an elevation of a combined selector and control valve.

Figure 14 is an elevation of the valve of Figure 13.

Figure 15 is an axial section of the valve of Figure 13.

Figure 16 is a section on line lS-il of Figure 15.

Figure 17 is a ure 15.

Figure 18 is an enlarged axial section taken at one end of the valve of Figure 13.

Figure 19 is an enlarged elevation of one end of the valve of Figure 13 with parts removed, and

Figure 20 is a section on line 20-20 of Figure 19.

Referring to the drawings, reference numeral designates generally a wheeled chassis including an engine compartment 28, a cab 21, transmission mechanism 28 and longitudinal frame members in the form ofchannels 23 and 30, Figure 3, these channel members being preferably sprung on the wheel axles. This construction is all of usual design and need not be specifically described for the purposes of the present application. The transmission 28, it may be stated. has the usual power take-ofl' provisions, these being utilized in the manner to be later on described.

A main tank 3| extends above the channel members 29 and 30 longitudinally thereof for support thereby. The tank is preferably made from a single wrapping sheet 32 and is divided into a number of tank compartments, thisnumher being six as here shown, by meansof dished bulkheads 33, these being provided with peripheral flanges 33' which are continuously welded to the inside .of the wrapper sheet and contribute considerably to the rigidity of the latter. Each compartment has a small well I in its bottom wall, Figures 1 and 3.

section on line l'I--l'| of mg- Referring particularly to Figure 3, two U-- v shaped channel members 35 and 30 are welded to the bottom'of the. tank and extend substantially throughout the length of the latter, the

ends of these channel members being closed by endwallsasat 8| andtlflthusenablingthenne be utilised as auxiliary tanks for the transportation of oil or other fluids.

Adjacent the front end of the tank, the latter has welded thereto a saddle member 31. Only one-half of this saddle member is shown in Figore-3, the remaining portion being a duplicate of that illustrated. Beneath the saddle member a bolster II is secured across channel members II and SI by means of U-bolts as at II. The saddle member and bolster define between them pockets in which are received suitably compressible rubber blocks as at ll, these blocks lying close to the central longitudinal vertical plane of the vehicle and being spaced at opposite sides thereof. Outwardly of blocks 4., the bolster presents downwardly -aced pockets in which are received similar blocks as at ll. Stirrup members as at 43, connected to the saddle member by bolts as at If, support blocks 4|;each block Ii thus cooperating with the block II on the other side of the vehicle in resisting rolling tendencies of the tank. Sufficient clearance is present between saddle member I! and the bolster ll, so as to permit relative movement of the two to the extent permitted by the cushion blocks. There may be two or more each of blocks 40 and H as conditions may require.

Substantially, over the rear axle of the vehicle, members 35 and it have brackets as at 44 secured thereto and beneath these brackets are secured, to the longitudinal members I! and 30, brackets as at ll. Brackets 44- and ll define between them pockets receiving compressible blocks as at 48. inwardly of the blocks 4! and below brackets 45 are disclosed additional blocks 41, these being supported on stirrup members ll connected to brackets N by bolts as at 4!.

It will be noted that blocks I! are substantially widely spaced as compared to blocks II. The arrangement is such that blocks 40 and 48 form, in effect, a three-point support for the tank, so that the latter is preserved to a great extent from torsional stresses which might otherwise be communicated thereto. It will be understood that the weight of the tank is supported by blocks 40 and 40 on the longitudinal chassis members, blocks ll and I1 cooperating with the first named blocks in absorbing lateral rolling tendencies of the tank.

Extendingalong and secured to the sides of the tank below its central horizontal plane are a pair of angle strips ill and BI presenting substantially horizontal flanges. Plates l2 and I have their inner edges supported on these flanges, the outer edges of the plates being supported by braces as at 84. Side plates 56 and 5| extend downwardly from plates I! and II, the lower edges of these plates being supported by braces as at 51. The ends of the angle units constituted by plates I2, ll and 53, I. are closed by plates as at El and II, the plate 68 serving as front wall of 9..

compartment which houses a pressure fluid reservoir hereinafter mentioned.

A substantially horizontal plate ll extends beneath plate I! substantially from end to end of the latter and projects beneath the lateral overhand of the main tank with its inner marginal portion welded beneath the outer lower marginal portion of the bottom of auxiliary tank II, the outer edge of plate I being welded to plate 5!. Above the rear wheels plates II and ll are provided with cut-outs, which are closed by a wheel oases hoodOl'andacut-outinplatellprovldingclearanceforbrscketuisclosedbrshoodli. Piste ",whichistotherearofbracesll andll,has an upper portion entirely closing the space he'- tweenthemaintank,tankfl,andplateslland II, and a similar closure plate connects the rear ends of these members to form a closed tank '2. Plate 6. may be slightly rearwardly inclined, free flow from the front of tank- I! to the rear being permitted in the space between hoods I and II. The portions of plates I. and I! below plate I serve as shields or aprons.

Tank 02 is preferably utilized for the transportation of lubricating oil or other comparatively non-inflammable fluid to be transported. A similar tank, beginning to the rear of the reservoir above mentioned, is preferably provided on the other side of the vehicle. All of the auxiliary tanks may be internally and externally reinforced as desired.

Preferably, the auxiliary tanks are fllled from the forward end of the vehicle. In Figure 2, reference numeral 63 designates a screw plug in the end of a tube extending from the top of rlmway I2 into the tank defined by channel member II and reference numeral 64 des gnates a similar plug closing the end of a filling pipe for the tank defined by channel member 38. Reference numerals 65 and 66 designate closure plugs or flliing pipes running to the side tanks as at .2. Drain faucets for the auxiliary tanks are provided in a compartment 61 at the rear of the tank. one of these faucets being shown at it, Figure 1.

Each tank compartment is provided at its top with a hand hole and with a two-way vent and pressure relief valve. In Figure 2, reference numeral 89 designates the hand hole for the rearmost tank compartment F, Figure l. A collar I. is welded to the tank above opening ll, the collar being provided with an outwardly extending peripheral flange II, Figures 3 and 6, which conforms to the curve of the tank and is welded to the latter. Collar Ill has a top inwardly directed flange 12, Figures 2 and 6, the top of this flange lying in a horizontal plane.

Referring particularly to Figures 5, 6 and 7, reference numeral ll designates generally a hand hole cover provided with a peripherial flange 14 secured against the top of flange 12 by riveting and welding, this cover having formed therein a circular opening ll surrounded by an upstanding wall 15. A hollow block 16 secured to cover It presents knuckles l'l between which is supported an arm .18 for pivotal movement about a horizontal bolt I9. Pivoted to arm I! on a pin ll par allel to bolt 19 is a stud ll, a similar stud I! being pivoted in block 16 on a pin 83. The studs have reduced ends engaged in the ends of a compression spring 84, which latter bears against shoulders at the ends of the reduced portions. Spring 84 in the position of parts shown, particularly in Figure 6, tends to move arm ll downwardly. Upon lifting the am, however, the axis of pin ll is adapted to pass below the axis of bolt 1!, so that spring 84 tends to hold arm 18 in upwardly extending position. Am 18 is reinforced by longitudinally extending ribs II and 80, these being accommodated in the upwardly extending position of the arm in recesses 01 and II formed in the top wall 88 of the block 18. An arcuate guard 9. connecting ribs 86 and IS in concentric relation with bolts I! and adjacent thereto moves under wall "without interference therewith as arm I8 is moved upwardly.

Arm'llisprovidedwithabossllhavinga" I bore '2 mm with the opening I4,

'borereceivingaboltllwhoseiowerthreadedend isensaaedinaboreprovidedinacentralbossfl ofacircularcapll,thecaphavinganannuiar receladaptedtooverliecircularwalllland uniiercut to retain therein a compressible washer II. The head of bolt II is receivedin a counterbore at the top of bore 42 and'a nut flv locks the bolt with cap ll. The relation of parts is such that bolt 08 in addition to being rotatable in bore llisalsolongitudinallymovablethereintoa 4.. formed in a boss portion ll of a lever III, the two parts being connected by a pivot pin III, which is perpendicular to arm ll. 'lhe boss portion has a bore I42 perpendicular to pin Ill and having flxed therein a headed pin Ill upon which is revoluble a roller I44.

interposed between a wing Ill ofboss I! and an abutment surface III of arm I4 is a compression spring I". which tends to rotate the boss II and lever I in a counter-clockwise direction about pin III, Figure 5. A wing portion I04, opposite wing I, is adapted to cooperate with an abutment I" formed on the arm "to limit rotation of the lever under the influence of spring Ill.

A bracket III secured to plate I8, at the free end of arm 18, has an upstanding portion III presenting a latch block II2 for cooperation with roller Il4. Block H2 is triangular in shape, as may be most clearly seen in Figure "I, having a top inclined surface II2a and a bottom inclined surface 2b. When the arm is moved downwardly to bring cap OI over opening I4, roller 4 strikes surface II2a and is cammed to the left thereby, Figure 7, so that the roller under the influence of spring II! is engaged under surface I I2b, the inclination of the latter being such that the roller in moving therealong, securely presses the gasket ll against the top of wall ll.

Cap 45 is held closed under the influence of springs 44 and iii, the former acting directly at the center of the cap, the mounting of the latter, above described, enabling it to seat itself to the best advantage on wall It. In the open position of the cap wherein it is held by the toggle arrangement 8|, .2, 84, the end of handle I00 rests against the base of block I8 as shown in dotted lines in Figure 6, thus limiting the openiing movement of the arm II. The pivot bolt I9v of arm ll extends transversely of the truck and the holding effect of spring 84 is sufiiciently delicate, so that any movement of the truck will sufiice to overcome the force of the spring, enabling itto swing arm II downwardly, roller I04 automatically engaging under block I I2.

Each tank compartment is provided with a twoway vent and pressure relief valve, that asso-.

ciated with tank compartment F being designated at III, Figures 2 and 3, and shown in detail in Figures 8 and 9. Each equalizing valve III comprises a tubular portion II4 provided with an annular rib Iii, which rests upon and is welded to the tank shell I2 about an aperture in the shell through which the lower portion of the tubular element extends. A lower cap member H6 is bolted to the bottom of member II4 by means of socket headed bolts I I1, whose heads are set in counterbores H4 at the top of element II4. Member H4 has an upwardly extending neck III within member H4 and spaced from the inner wall of the latter to provide an annular space Ill. Cap II is provided with an -ao,sss

the

aperture'lllinits iowerwaii.theuppermar-' sinsofwhicharerabbetedtoformanannular ledge or :aeat Ill, the base ofneck III being m' debouching above ledge m.

a lieevevalve m a slidable In neck m, the

stem I24 'upon whose upper extremity is threaded and locked a nut I24. interposed between a rabbeted seat Ill formed on the. upper inner edge of ledge I24 and a washer Iii on stem I28 beneath nut I", is a compression springdfl, which normaily acts to hold valve I24 againstits seat I28. A creneilated ring nut III is threaded in the upper end of neck H8 and locked therein by eans of a wire I84. Engaged between nut I and a depressed seat formed in the top of ledge I24 is a compression spring I, which normally acts to hold valvev I22 on its seat I2I.

A flne mesh screen I" is engaged between the top of element H4 and a ring I" secured to the latter by means of cap screws III, which also serve to secure in positiona cap I, the cap screws passing through spacing bosses as at I40. which overlie ring I". Finally, at either side of counter-bores 4' the exterior of tubular element H4 is notched as at I4'I, Figure 9, and a sealing wire I42 is passed through bores I42, which connect the adjacent notches and Intersect counter-bores H4. The seaiing wire prevents undetected disturbance of bolts I I1.

Springs I22 and I" are set as required by initank interior momentarily with the atmosphere.

Upon the occurrence of an excessive pressure in the tank compartment pressure relief valve I22 will be moved upwardly, uncovering es I22 and thus connecting the tank with the atmosphere. Due to the position of the sealing wires I34 and I42, it will beevident that the initial setting of the valve cannot be disturbed without detection.

The hydraulic tank discharge system will first of all be more or less generally described with particular reference to the diagram of Figure 4. The main tank is considered to be divided into six tank compartments A to F, of which C to F appear in Figure 4. In tank P, which is the rearmost, isdisposed a combined motor and pump unit, designated generally by the reference numeral I44. Reference numeral I45 designates one of a pair of rotary motor pistons, these being connected together by means of pilot gears, of which one is shown at I46. Mounted on the ,shaftsof the motor pistons are a pair of similar pump pistons, one being shown at I41. Below the pump compartment, and preferably in the same casing with the motor and pump, is a chamber I48 having a bottom opening I49 closed by a valve disc I"; which is seated on an annular ledge Iii at the bottom of chamber I48 by means ,of a compression spring I52.

me pump casing has an intake opening I88 and a discharge opening I88. A maniiold I85, which extends above all oi the tank compartments, is connec into the inlet opening I88 and has branches I I88d, Illc and I88! connected to the outlet openings of valve housings I88. The valve housing I88 in compartment 1", is shown in cross-section and will be particularly described, it being understood that the remaining valve housings I88 and appurtenant parts are identical.

The outlet opening the valve housing I88 in compartment 1' to which branch I55! is connected is designated by the reference numeral I81. The housing provides an inlet passage I88, which has a horizontal portion above a horizontal portion of passage I51, the two passages being connected through an aperture I88. A valve.

disc I88 seats on the upper margins oi aperture I88 and has a stem I8I fixed thereto and guided in a bore I82 in the valve housing. the lower end of the stem projecting into a chamber I88 in the valve housing. A duct I88 connects cham ber I88 with the valve housing exterior.

Valve I80 is normally held in seated position by means of a compression spring I8I interposed between it and the valve housing wall thereabove. However, the valve is adapted to be unseated in response to pressure introduced into chamber I88 and acting on the lower end of stem III. A suction pipe I85 extends downwardly from inlet opening I88 with its lower end adjacent the bottom of the tank and above well 88, Figure 1, the suction pipe being steadied by a brace I88 welded at its upper end to the housing I58 and at its lower end to the pipe.

A selector valve I81 has a casing providing a cylindrical chamber I88 pierced at diametrically opposite points by relatively large apertures I88 and I18. At six equally spaced points between openings I88 and I10, the upper wall portion of chamber I88 is provided with apertures Al to FI, the lower portion of the chamber being surrounded by a wall I'll, which, with side walls forming parts oi the casing, defines a passage I12 connecting ports I88 and I10.

Rotatable within the chamber I88 is a valve plug I18, which has the hollow diametrically opposed spout portions I18 and I15 whose ends have a close running lit with the walls of chamber I88. A tube F2 connects port Fl with duct I88 and tubes A2 to E2 connect ports Al to El with similar ducts oi the other valve housings I88. The outlet sides of the hydraulic motor is in co mmunication with passage I12 0! the selector valve by means 01' a tube I18.

vA control valve I". has an upper chamber I18 presenting a ledge I18 upon which is seated a valve 'disc I88 by means of a compression spring "I interposed between the valve and the top wall of the chamber. A stem portion I82, fixed to valve I88, projects through the top wall of chamber I18 and has pivoted ,thereto an operating lever m. A stem portion In fixed to'valve of valve I11 through a branch I82, the end 01' conduit I8I being connected through a suitable swivel connection to the interior of valve plug I18. Chamber I81 oi valve I11 is connected by means of a line I88 to the inlet side of the hydraulic motor and an exhaust line I88 for the entire system is in connection with a port 188 formed in wall ill of valve housing I81.

Assuming pressure fluid to be flowing in conduit I8I in the direction indicated by .the arrows, pressure is exerted on the top of valve disc I88 of valve I11 and on the bottom 01' piston I88, the pressures substantially balancing, so that the valve disc I80 is held seated by the force of spring I8I. Valve plug I18, being positioned as shown, the pressure fluid passes through spouts I18 and I15 and ports I88 and Ill to the exhaust line I88 via port I85. It the valve plug I18 is rotated in a counter-clockwise direction to bring spout I15 over orifice AI, pressure is communicated through line A2 to the valve housing I58 in tank compartment A, so that valve disc I88 is unseated and a connection is established between the suction pipe and manifold I55, which through port I58 is in connection with the intake side of the pump chamber. It lever I88 oi the control valve I11 is now lifted, fluid under pressure passes through chambers I18, I81 and conduit I88 to the inlet side of the hydraulic motor to drive the latter, the motor exhaust passing through conduit I18 and valve passage I12 to the exhaust line I88.

Under these circumstances, fluid is withdrawn from tank compartment A, it being noted that the valve discs I50 in all the other compartments are held firmly seated not only by their springs I8l, but also by reason of the suction existing in manifold I55 and acting on the lower faces of the valve discs.

It will be understood that upon further rotation oi valve plug I18 to bring spout I15 over orifice BI, the pressure will be relieved in line A2, so that the valve disc I80 in compartment A is immediately seated by its spring I8I, the valve disc I00 in compartment B being unseated in re-- sponse to the pressure now existing in line B2. In stating that the pressure is relieved in line A2, it will be understood that this line, due to the described further rotation of the valve plug I18 has been placed in communication through orifices I and I85 with exhaust line I88.

Upon movement 01' valve plug I18 from its illustrated, neutral position, spout I18 is closed by the imperi'orate lower wall portion of chamber I68. The pressure existing in spout I18 thus substantially balances that in spout I15, so that transaxial distortive effect on the plug is obviated.

The discharge port I58 of the pump is connected by a conduit I88 with a discharge pipe I81. A fitting I88 at the upper end of pipe I81 has an upward extension I88, whose top wall is provided centrally with an orifice 200. A spider 20I, in extension I88, slidably supports the stem 202 of a valve body 208, downward movement of the stem being limited by a stop 288 thereon which is adapted to rest on the spider. A flap 205 pivoted on a transverse axis 208 in fitting I88 is adapted to be lifted upon the flow o! fiuid through the fitting, abutting the lower end of valve stem 202 and elevating the valve body 208, so as to close orifice 200. Upon cessation of flow, fiap 205 drops, permitting valve body 288 to drop, thus opening orifice 200. Valve body 208 thus acts as a spihon breaker or vent, permitting the discharge pipe I81 to drain. Referring momentarily to Figure 1, discharge pipe I81 has a length the storage tanks into which connection is made through hose Ill. with the hose'making an air-tight connection with such a storage tank,

means have been provided to cause the fluid to bypass through the pump when the fluid has reached a certain level in the storage tank vent pipe. When a certain predetermined head has beenobtainedinsuchavent pipe,backpressure through conduit ill is communicated ha branch line lll thro gh P t ill to the bottom ofvalvedisoilliiftingthelatteragainstthe force of spring-Ill and permitting fluid to pass through chamber Ill and a connection III to manifold Ill adjacent the pump intakeport ill. Hereupon, as will be understood, the pump outputismereiybypaaedthrough thepmnpand no hirtherdischargetothestoragetankcan occur. It will be understood that the force of spring illcanbesochosenastotakecareof any dischargeconditions.

As was stated at the outset, the source of hydraulic pressure for driving the discharge pump motor is preferably a master pump driven from p the usual power take-oi! of the truck. Referring still to Figure 4, reference numeral 2i! designatesamasterpumpoftherotarypistontype,

one of the pistons being shown at Ill and its associated pilot gear being shown at ill. The drive shaft ll! of the pump has flxedthereto a gear lll adapted to be engased by a slidable gear lll constantly in mesh with the power takeofl gear. Gear 2" has an elongated hub Ill provided with an annular recess Ill engaged by a shipper member Ill, the shipper member being fixed on a longitudinally slidable rod Ill. interposed between the end of the shipper member flxed to rod Ill and a flxed abutment 222, is a compression spring Ill, whichacts on rod Ill and the shipper member 220 to move gear I" out of mesh with the gear Ill, as shown.

'The end of rod lll opposite the shipper member is slidable in a bore provided in a cam block 224 which presents atop cam surface inclined downwardly toward the shipper member. A clevis 226 secured to the outer end of the cam block has a recess 226, which receives the headed end 221 of rod III with possibility of limited axial movement. Pivoted to the clevis is an actuating clever Ill. Intermediate fixed abutment 222 and cam block 224, an abutment 229 is fixed on rod Ill and a washer Ill of easily fusible material is interposed between abutment 229 and a washer lll, which provides a wearing surface for a purpose to be explained. The fusible washer ill is bonded as by slight fusion to both abutment Ill and washer Ill, so that thethree elements form, in eflect, a unitary abutment.

A bell crank lever Ill pivoted at 2ll on a bracket Ill has a nose Ill, which rides on the cam surface of block 2. Intermediate its nose and pivot, the bell crank lever has formed thereon a dog Ill and at its extremity opposite nose lll the lever has secured thereto a tension spring I", which acts to hold nose ion the cam surface. Reference numeral Ill designates a rod connected through a pin and slot connection Ill with the clutch pedal ll of the vehicle, Figure 1.

Pivoted to the bell crank lever adjacent rod by the-dischargesystemis m is and lli,.which, at its opposite end, is pivoted to an arm Ill mounted on a rock shaft Ill. Referringaho to Figure 8. rock shaft lll -hasflxedtoitsother-endanarticuiatedarmlll ithearmbeingartlculatedonanalislllwhich is P rpendicular to'an axial plane oi'shaft Ill. The upper end of the arm, above the pivot point, carries a button 2 and proiects behind the front companion flange I" of the front universal Joint of the truck drive. The front face of flange;

I" is provided with a plurality of triangularlyshaped-cams ill, seealso l'igurela,whosepath of rotation is such also enable them to engage button I" under conditions to be hereafter described.

The inlet port of pump III is connected with a reservoir 2 by means of aconduit Ill and the supply conduit Ill is connected to the outlet portofthepump. lnabypass Ill betweenconduits Ill and III is arranged a pressurerelief valve ill, so that pressure output not absorbed merely bypassed through the master pump Ill.

- To place pump II! in operation, assuming the truck motor to be running, lever Ill, l 'igure 4, is operated to move rod ill to the'left against spring Ill, thereby placing gear III, which is constantly in mesh with the power take-ofl Bear;

in mesh with the gear Ill. Upon movement-of rod III to the left,- cam nose Ill rides down on the cam surface of block 224 until dog Ill engages behind washer Il I. This movement of the bell crank lever has caused rod ill to be moved to the right, this being permitted by the pin and slot connection lll without aflecting the position of clutch pedal Ill, and has moved rod Ill to the right to bring button 2 of lever 2 inclose proximity to the front face of flange I". If a cam 148 is immediately in register with button 246, Joint I. about which the upper end of lever I is swingable to a limited extent in either direction from its normal vertical position, permits the button to ride down one or the other of the faces of the cam in question. It will be noted from Figure 3 that the upper and lower portions of lever I present opposed shoulders adjacent pivot Ill and relatively weak spring interposed between these shoulders maintain the upper lever portion in its normal vertical position. It will be understood that flange I" is stationary in view of the neutral position of the truck transmission searing.

.If, through accident or inadvertence, clutch pedal 2 is moved, as for the purpose of engaging the truck transmission gearing. the bell crank lever 2l2 will be swung in a clockwise direction about its pivot, thus disengaging dog Ill from washer Ill. Hereupon, rod Ill is immediately moved to the left under the action of spring Ill disengaging gear I" from gear Ill and thus arresting drive of the master pump, so that the operation of the discharge apparatus is discontinued.

- Should, for any reason, as accidental release of the brake, the truck start to move in either direction, flange I" is rotated. Such rotation results in the impingement of a cam III on button 2. thus, through rock shaft Ill and lever 242 moving rod I to the left, Figure 4, disengagingtdog Ill from washer ill and permitting the disengagement of gear I" from block iil acting to eam nose ill upwardly, so thatdogiil isreleasedfromwasheriil.

Under ordinary circumstances,-movement of I clevls iii and block iil to the right through actuation of lever iil wilicause the upward carnming of nose ill and release of dog ill during the lost motion travel of the clevis and block relative to rod iil as permitted by the previously described relation of head iii to recess iil.

Preferably, the operating lever for red iii is placedinthetruckcabandinl'igureiisshown as being so positioned. In Figure l. the lever is designated by the reference numeral ill and its connecting rod by the reference numeral ill.

Such parts as master pump'ili and gears ill and iii are preferably contained-in a-iianged housing such as is shownat ill, Figures land 3. thishousingbeingboltedtothetransmission casing ii. The reservoir ill is preferably sup-- ported under the forward end of runway li and provided with a filling opening ill in plate li, as indicated in Figure 2. The reservoir connections have the same reference numerals in Figure l as in the diagram of Figure 4. r

- It will beiunderstood that the showing of the valve housings Ill in Figure 4 is diagrammatic, the actual form of these units being preferably as indicated in Figure 1. A lower casting has formed therein the valved fluid passage and is supported by means of a cap element ill which is secured by welding in an opening in the tank top, manifold Ill being connected into this cap member and therethrough with'the fluid passage in the lower casting. As particularly shown in Figure 2, the manifold Ill is disposed to one side of the hand holes, the pressure lines A2 to Fi being disposed at the other side of the hand holes, all of these lines beingprotected by a shroud ili. Also the hydraulic motor, pump, and relief valve arrangement shown in Figure 4 is more or less diagrammatic and a preferred=arrangement of these devices is more particularly shown in Figures 10 to 12, the'general disposition thereof being shown in Figures 1, i, and 3. Referring to these figures of the drawings, reference numeral ili designates generally acasing in which is arranged the motor, pump and relief valve and communicating passages. The main part of this casing is made up of sections ill, ill, ill, ili, ill and ill. Sections ill and ill are registered by means of pins ill, section ill being secured to section ill through section ill by means of cap screws ill. Sections ill to ill inclusive are held in register by means of pins in and are secured together by means of cap screws ill whose heads engage sectionill and whose threaded ends are engaged in bores in'section ill. Two parallel shafts ill and ill are join-nailed in casing ill, the upper end portions of these shafts being journalled in ball bearing assemblies ill and iii engaged in recesses in the top of section ill. The lower ends of shafts ill and iii are Journalled in bushings ill .and ill which have lower reduced portions engaged in bores in section ill and held against rotation by means of pins ill and ill. The upper enlarged portions of the bushin s rest on top of section ill.

The lower portion of section ill has formed therein a motor chamber ill in which are disposed a pair of rotary pistons ill and ill keyed to shafts ill and ill respectively. Pinned to shafts ill and ill, in a pump chamber ill formed in section ill, are a pair of rotary pump so,s ss

pistons ill and ill. The pump the same cram-section as the motor pistons, but are of considerably greater longitudinal extent as shown. Preferably all the cooperating pistons are arranged slightly out of contilt with each other and with their cooperating walls so as to pistonsli'eof" being c'r'enellated to receive a complemental wrench and the lower walls of the said elements being apertured to pass shafts ill and ill with a close runningflt. Each cup-shaped element ill and ill contains a. packing unit comprising upper and lower members ill and ill connected by law teeth and forced apart by a compression spring ili which, at itslower end, bears against a number of gaskets ill. The upper members of these units are forced against the motor pistons while the lower members bear against the bottom walls of elements iii and ill.

A pair of pilot gears ill and ill are pinned to shafts ill and ill respectively in aphamber ill formed in section ill, these gears serving to maintain the proper angular relation of the motor and pump pistons. Expansion members iii and ill set in a wall ill and in alignment with shafts ill and 2" respectively bear against balls ill and ill disposed in depressions in the upper ends of the said shafts, so that a downward pressure is exerted on the latter counter to the action of springs ill.

Formed in sections ill and ill is a passage il'l which serves as an inlet for the hydraulic medium, the lower end of tis passage being on the inlet side of the motor pistons, the outlet passage for the hydraulic medium being designated by the reference numeral ill. The hydraulic medium, which is a lubricating oil, has access to the upper bearing portions of the shaft and to the pilot gears. In order to lubricatethe lower ends of the shafts, the lower portion of section ill is provided with a passage ill which extends under the shaft ends as particularly shownin Figure 11 and which is connected with the motor chamber by means of a duct ill, Figure 10.

In the inlet side of the pump chamber ill is formed a cylinder ill in which is reciprocable a piston ili. A stem ili projecting from the lower end of the piston is guided by a spider ill arranged in a cavity ill in the lower portion of section ill, cavity ill communicating with the lower end of cylinder ill through an aperture ill. A compression spring il'l surrounding stem ili abuts with its upper and against spider ill and with its lower end against a washer ill held on the stem by locked nuts ill threaded on the stem. Spring "1 tends to hold piston ili in the position illustrated wherein its lower edge seats against the margins of aperture ill, in which position the cylinder closes an opening ill formed in the lower portion of cylinder ill and connecting the interior of the latter with the intake side of the pump. The lower end of stem ili projects through an opening ill in the bottom wall of section ill into a well provided by a cap member ili secured to section ill. Within the well a washer ili is secured on stem ill by means of nuts'ill and ill.

A passage Ill formed in sections Illto' Ill serves as intake passage for the pump, the discharge passage being designated by the reference numeral Ill. An aperture Ill in section Ill connects the outlet side of pump chamber Ill with a passage Ill formedin section Ill and extending across the latter to cavity Ill in section llland also communicating with the interior of cap element I II by means of aperture Ii l through which stem IlI extends. I

Upon the supply of pressure fluid to the motor through inlet passage lll, the latter is caused to drive the pump. which withdraws fluid from the selected tank through intake passage Ill, discharging the same through discharge passage I I 1. Upon a backing up of pressure on the discharge side of the pump. caused for example by a predetermined head in the vent pipe ofuhe storage tank to which delivery is being made, piston Ill is moved upwardly against the force of spring- Ill, thus uncovering opening Ill in cylinder Ill and establishing 'a bypass so that discharge is discontinued. In the operation of piston Ill, washer I II has a dashpot eflect preventing sudden movement of the piston. Adjustment nuts Ill and consequent adjustment of spring Ill enables the byp s arrangement to be set to become effective upon the occurrence of a predetermined back pressure. No means is necessary to limit upward movement of piston Ill, since opening Ill is of size to pass the entire pump output.

Unit III is completed by a cap member or header Ill, Figures 1, 2 and 3, whichis set in an aperture'in the top of the wrapper II andhas a flange Ill resting upon and welded to the latter. Cap member III is bolted to section lll of unit Ill and has passages formed therein registering with passages Ill, Ill, Ill and Ill of section Ill. e Ill, which is the pump intake passage, is connected through a connection III with the rear end of manifold ill. Discharge passage Ill through a connection III and a conduit section Ill, Figure 2, is connected into the previously meral Ill.

described fltting ill, conduit IIl of Figures 1, 2 and 3 corresponding to conduit Ill of Figure 4. A supply conduit III for the pressure fluid is led into cap member Ill to the inlet passage Ill, an outlet in extension of passage Ill being provided through the cap member and a conduit Ill.

Fluid discharge from a selected tank is possible only when the discharge pump is driven and the preferred form of pump as Just described is such that when it is inoperative it positively closes the discharge line. Due to this characteristic of the pump and to the provision of the siphon breaker, any siphon discharge is impossible.

I have hereinbefore described, with reference to Figure 4, a selector valve and a control valve, these having been illustrated in Figure 4, for the pu'rposeof simplifying the showing, as separate elements. Preferably these valves are embodied in a unitary structure and are controlled by a common lever which is swlngable about one axis to operate one of the valves and about another axis to operate the other valve. Also the arran'gement is such that operation of the control valve is impossible before the selector valve has been set. This novel valve arrangement is shown in detail in Figures 13 to 20, its disposition relative to the truck being shown in Figure 1.

Referring to these figures, the combined valve is designated as a whole by the reference nu- The valve casing is made up of sections Ill, Ill and Ill, Figure 15, these sections being held together by cap screws III. Section m a tor-mes with a frusto-conical chamber as:

tapered toward section Ill and revolubie in this chamber is a selector plug III. As most clearly shown in Figure 17, the plug III, which is hollow, has two diametrically opposed extensions Ill and III, which have a close running flt with the walls of chamber III, the extensions being provided with longitudinally extending slots Ill and III. At diametrically opposite points the wall of chamber III is provided with openings III and'IIl. which are connected by a. passage Ill formed in section Ill. Section III is providedwith a base Ill adapted to be secured to a bracket Ill in the compartment ll at the rear of the tank Ii, Figure 1 The return pipe Ill'from the pump driving motor is connected into passage Ill through a port Ill; the return line lll to the tank Ill being connected into passage Ill-through a port Ill.

Formed in section III between openings III and Ill, opposite passage Ill, are six equi-distantly spaced radially directed ports Al to. PI, of which Al to El appear in Figure ll, Fl appearing in Figure 15. l'br the sake of compactness, the ports are staggered as indicated in Figure 14, the longitudinal extent of the stagger being less than the longitudinal extent of slots Ill and III in extensions lIl and Ill. Pressure lines Al to Fl, Figures 2, I and l, are connected into ports AI to Fl respectiveLv.

Plug III has a hub portion Ill extending into a chamber Ill of section Ill and has an annular shoulder Ill bearing against a ledge Ill presented by a flanged ring nut Ill threaded into the end of section Ill. A packing element comprising sleeve members Ill and Ill interengaged by jaw teeth surroimds hub Ill hearing at one end against a shoulder III of the latter and at the other end against ring nut Ill. Members Ill and III are urged apart by a compression spring III, which bears at one end against an internal ranged in a bore in section III in position to engage in depressions as at Ill in the rear edge of plug III, there being six of these depressions respectively engaged when slot I" is brought into register with one of the ports AI to FI. In Figures 15 and 17, it should be'pointed out, slot Ill is shown as being in register with port FI, while in Figures 13 and 14, plug III is assumed to be in its neutral position wherein slot IIl is in register with opening III and slot III is inv register with opening Ill.

Hub Ill has an axial bore receiving a shaft Ill, there being an enlarged cavity Ill within the hub communicating with chamber III by means of a duct Ill. Further, hub Ill has a reduced portion Ill projecting outwardly of nut Ill, portion'Ill having secured thereto by means of a pin Ill, the hub portion Ill of an arm Ill, Figures 15 and 18 to 20. Arm III has a bifurcated' end in which is engaged one end of a torsion spring Ill which surrounds the reduced extremity of section Ill and has its other end en aged in a hole in the latter, Figures 15, 19 and 20. Spring Ill acts continuously to hold plug III in its neutral position or to return it to such position when it is moved therefrom.

Section Ill comprises a boss portion Ill which projects within plug III as most clearly shown in Figure 15, reference also being bad to Figure 16, the boss portion being provided with a bore Ill coaxial with plug III. The boss portion is bywslb Ill and lll. which deflne a palsasellldebouchinsintoaportlll intowhich closurecaplllhasaflangellloverlyingflange 818 and secured through the latter to section lll by means oi cap screws llI. Finally, section lll has sport lllwhlch,throughalim lll.isin communication with chamber Ill in section Ill.

berlllisfllledwiththepressurefluidwhich,ln thepositionoipartsshowninl 'lgurelb,issliut ofl'iromportlllbyvalvedlscl'll. Intheneuthe plug Ill the pressure fluid throush nub Ill, Flgum l5 and 18 arms 8" of a lever lll, armsll'l being pivoted hub portion lIl, the valve plug latter to its desired position of Lever lll is also swingable about axisolbolt lll relativetohub lll for a which will now be described.

Shaft III is slishtly reduced beyond the exmember Ill is areadib fusible ring "I. PreterahlytheendsoirlngllIaretaperedandthe adiacentends oiringslll and Ill are complementarilyundercut,asshown.

Armslllandlllarecoaxiallypivotedtothe leverarmslllbymeansoicapscrewslll and III, these latter tending normally to hold pivotedendsoiarmslllandlllflatiy :heparallel underlying surfaces oi lever the ' enhancement-1am" l0.thesesuriacesbeingbissotedrespectivelyby slotlllandIllwhichnmtothisouterextremity llemberlllhsslugsasatlllor member lll. and Ill at its outer eatremityjat each side of the slots. 'ihesecondlugatsiot Illlsshownatlll. Figure 19.

Athimble IllhssaboreIll in whichisreceivedinsiidingrelationtheextremityotshai't III. the thimble extending within member lll and having a cylindrical enlargement Ill guided by the inner surfaces of member lll. Enlargement Ill is provided with an annular groove Ill bounded at one side-by a conical wall III as most clearly shown in Figures 15 and ll. As willbeseemtheconicalwallIlIisatthatside of groove Ill nearest the outer extremitgoi the thimble.

The tree extremities oi'arm lll and lll are mutually approached to rest flatly against the plane surfaces oi member lll with the ends 0! the arms substantially in abutment with the lugs as at Ill and Ill at the end oi member lll. Studs Ill and Ill flxed in the tree extremities oi arms Ill and lll pass through slots rear wall of groove Ill against pins Ill and Ill when the latter are in their normal position, which is the position shown in iulllines in Figure 18. with the parts thus disposed. thimble m projects beyond the extremity of shaft m.

Wall Ill oi thimble III is at the inner end of a bore enlargement Ill within the outer endoi which elements lll and III are positioned.

InFigurel9.leverlllisshownasbeing swung to the right or away from section lll. Arms lll and lll. being engaged behind the lugs of member III in the manner shown in Figures 18 andi9, carry the said member rearwardly. The end wall of member lll, acting through rings Ill, as and "I, causes shalt III to be axially displaced against the force 0! spring lll, thus unseating valve disc l'll and placing inlet port lllin communication with outlet port "I, so thatpressure fluid is supplied to the pump driving motor. Upon release of handle lll, valve disc lll' is immediately seated due to longitudinal displacement of shaft lll under the force oi spring lll.

A guard Ill is secured to section lll by means 01' cap screws Ill, these screws being conflned to the'upper portion of the guard. The lower substantially semi-circular portion of the guard projects back towards lever lll in proximity to the pathoiswingoithelatterabouttheaxisoi shaft ll'l when the lever is in its normal position. shown in Figures 14 and 15, with respect to pivot bolt lll. vWith plug lll in its neutral podtion, lever Ill occupies the oi! position shown in Figure 13, wherein it lies behind a solidedgeoitheguardandhenceisprevented bythelattertrom beingswungabouttheaxisoi bolt lll. when the handle is swung about the axisoishaitllltoanyoneoithesixpositions indicatedin-Flgure 13.itisinregisterwithone tank A will be opened. With the handle in position No. 2. the suction line from tank B will be opened, and so forth. It will be evident that unless handle III is in one of the 'six positions indicated so as to open the suction line of a selected tank, it cannot be swung about the axis of bolt III to unseat valve disc I'll and initiate operation of the pump motor. If the pump motor is placed in III, it follows that the suction line from one of the tank compartments must have been opened. Thimble til projects through an opening provided in guard III in the normal position of urine will extent when lever III is swung to place the pump motor in operation. It will be evident that to hold valve disc I'll unseated, it is necessary that the operator hold lever IIti against the force 'of spring III. the spring seating the valve disc to stop the pump motor immediately upon release of handle III. Since a careless operator may block or tie handle III in such position as to hold valve disc I12 unseated, the safety release controlled by-thlmble lit has been provided. A blow on the end of the thimble willcause the surface III to cam studs Ill and III outwardly, disengaging the ends of arms III and III from the lugs l1 and Ill so that valve disc III is immediately seated due to the action of spring III.

Compartment II is provided with a door "I, which is adapted to gravitate to closed position, but which may be held in open position by means of a link I pivoted to the doorand adapted to have its lower end supported on a readily fusible abutment III. The position of the combined valve I" is such that when thimble I is projected due to the actuation of lever III, the end of the thimble will be struck by door "I in closing. Thus, assuming lever III to be blocked with valve disc Il2 unseated,'any rise in temperature which will cause fusion of abutment 4" will permit door III to close and by striking the end of thimble llll to enable valve disc I'll to seat. Further, any rise in temperature which will cause the fusion of ring I will permit shaft Ill to move rearwardly relative to member III to seat valve disc I'll.

Thus, under normal conditions, springs IN and Ill act to hold the selector and control valves in on position and the control valve cannot be actuated except subssequent to actuation oi the selector valve. Even if. the purpose of these provisions is ignored by a careless operator cutting oi! oi the pump motor will occur automatically under the conditions described above.

Pressures within valve III are equalized as far as possible on the movable valve parts, so 'as to facilitate operation of the latter. Spring III acts' against the force of the pressure fluid on the face of hub portions III of the selector plug and assures proper contact of extensions III and III with the inner wall of chamber III. When plug III is in its neutral position, slots III and II! are in register with openings III and II! as has been explained, the reactions on the plug thus being balanced. When slot III is brought into register with any one of the ports AI to FI, slot III overlies an imperlorate wall portion II! of chamber II2, so that again transaxial stresses on the plug are substantially balanced.

The rear end of piston I'll is in a chamber III of section- III, this chamber communicating with port III. Consequently the same pressure exists at the rear end 01 piston I'll as at its foroperation by movement of lever be moved outwardly to a further 9 ward end which is in chamber III. The chamber which houses spring III is in communication with passage I through a duct Ill, Figure 15.

From the above description, it will be seen that I have provided a tank truck of improved design and a discharge system em dying to a maximum degree features of eiliciency and safety. I do not limit myself to the exact construction shown and described, since many variationsare possible within the scope of the invention as defined in the following claims.

I claim: H v

1. ma tank truck, a plurality of tanks, a

P p. conduits connecting the tanks with the intake side of. the pump, a valve in each conduit normally closing the same, hydraulically actuated means associated with each valve for controlling the same, a source of fluid under pressure, means including a selector valve operable to direct fluid from the source to a selected valve controlling means, a hydraulic motor for driving the pump, a pressure line connecting the source and motor, a valve operable to control flow through said pressure line to the motor, and a discharge conduit in connection withthe discharge side of the pump.

- 2. In a tank truck. aplurality of tanks, a pump; conduits connecting the tanks with the intake side oi the pump, a valve in each conduit normally closing the same, hydraulically actuated means associated with each valve for controlling the same, a source of fluid under pressure, means including a selector valve operable to direct fluid from the source to a selected valve controlling the means, a hydraulic motor for driving the pump. a pressure line connecting the source and motor, a valve operable to control flow through said pressure line to the motor, and a discharge conduit in connection with the discharge side of the P mp. said selector valve and motor control valve being both disposed at the rear end of the truck and having a common operating lever which is swingable about one axis to efl'ect. adjustment of the selector valve and swingable about another axis to eflect adjustment or the motor control va ve. 3. In a tank truck, a plurality oi tanks, a pump, conduits connecting the tanks with the intake side of the pump, a valve in each conduit normally closing the same, hydraulically actuated means associated with each valve for controlling the same, asource 01' fluid under pressure, means including a selector valve operable to direct fluid from the source to a selected valve controlling means, a hydraulic motor for driving the pump, a pressure line connecting the source and motor, a valve operable to control flow through said pressure line to the motor, and a discharge conduit in connection with the'discharge side .of the pump, the pump being designed to prevent flow therethrough when at rest.

4. In a tank truck, a plurality of tanks, a pump.

conduits connecting the tanks with the intake means, a hydraulic motor for driving the pump,

a pressure line connecting the source and motor, a valve operable to control flow through said pressure line to the motor, a discharge conduit in connection with the discharge side of the pump, said discharge conduit havinga depend- 7s ingportiomandasiphonbreakerat thetopof said depending portion.

5. Inatanktruchaplurallty oftanks,apump, condultsconnectingthetankswiththe intake side or the pump. a valve in each conduit normally closing the same, hydraulically actuated means associated with each valve for controlling thesalnaasource of fluid under pressure, means including a selector valve operable to direct fluid from the source toa selected valve controlling means, a hydraulic motor for driving the pump, apressurelineconnecting thesourceandmotor, a valve operable to control flow through said pressin'e line to the motor, a discharge conduit in connection with the discharge side of the pump, the pump being designed to prevent flow therethrough when at rest, said discharge conduit having a depending portion, and a siphon breaker at the top of said depending portion.

6. Ina tanktruckaplurality of tank's,apump,

conduits connecting the tanks with the intake side of the pump, a valve in each conduit normallyclosing the same, pressure responsive means in connection with each valve for controlling the same, a selector valve including a casing and a rotary selector element in the casing, pressure linesconnectingthecasingandsaidpressure responsive means, a source of fluid under pressure in connection with said casing and adapted to be connected with any one of said pressure lines upon sdimtment oi said selector element, a Irv-- draulic drive motor for said pump, a connection between said source and motor and including said casing, a motor control valve in said casing, a common operating member for said selector valve and said motor control valve, and a discharge conduit in connection with the discharge side of the pump.

km a tank truck, a plurality of tanks, a pump, conduits connecting the tanks with the intake side of the pump, a valve in each conduit normally closing the same, pressure responsive means in connection with each valve for controlling the same, a selector valve including a casing and a rotary selector element in the cas ing, pressure lines connecting the casing and said pressure responsive means, a source of fluid under pressure in connection with said casing and adapted to be connected with any one of said pressure lines upon adjustment of said selector element, a hydraulic drive motor for said pump, a connection between said source and motor, a valve for controlling flow through said last named connection, a common operating lever for said rotary selector element and said motor control valve, said lever being swingable about the axis of said selector elent to effect adjustment oi said element and being swingable about another axis to effect adjustment of said control valve, and a discharge conduit in connection with the discharge side of the pump.

8. In a tank truck, a plurality of tanks, a suction manifold having connections with said tanks, hydraulically operated means for controlling the connection to a selected tank, a pump at the discharge end of said manifold, a hydraulic motor for driving said pump, and means operable to control selectively the operation of said hydraulicalhr operated means and to control the operation of said motor.

9. In a tank truck, a tank, means for emptying the tank comprising a pump and a hydraulic pump driving motor positioned within the tank, a source offluid under pressure, said source being external of the tank, a supply conduit connecting said source and said motor, an exhaust conduit. leading from said motor to the exterior of the tank, and a discharge conduit leading from said pump to the exterior oi. the tank; said conduits leading through the top of the tank.

10. In a tank truck. a plurality of tanks, a pump in one end 01' said tanks, conduits connecting the tanks with the intake side of the pump, a valve in each of said conduits normally closing the same, hydraulically actuatable means associated with each of said valves for controlling the same, said last named means being disposed in the respective tanks, 9. source oi fluid under pressure. said source being external of the tanks, a

selector valve external of the tanks, lines connecting said selector valve with the hydraulically actuatable meansrespectlvely, said selector valve being operable'to direct fluid from the source to a selected hydraulically actuable means, a hydraulic motor for driving the pump and positioned in the same tank with the latter, a pressure line connecting said source and motor, an exhaust line for the motor leading from the latter to the exterior of the tank, a discharge conduit leading from the discharge side of the pump to a point external of the tanks, and a valve operable to control flow through said pressure line to the motor.

11. In a tank truck, a plurality of tanks, a pump in one oi said tanks, conduits connecting the tanks with the intake side of the pump, a valve in each of said conduits normally closing the same, hydraulically actuable means associated with each of said valves for controlling the same, said last named means being disposed in the respective tanks, a sourm of fluid under pressure, said source being external of the tanks, a selector valve external of the tanks, lines connecting said selector valve with the hydraulically actuatable means respectively, said selector valve being operable to direct fluid from the source to a selected hydraulically actuatable means, a hydraulic motor for driving the pump and positioned in the same tank with the latter, a pressure line connecting said source and motor, an exhaust line for the motor leading from the latter to the exterior of the tank, a discharge conduit leading from the discharge side of the pump to a point external of the tanks, and a valve operable to control flow through said pressure line to the motor, all of said lines and'said discharge conduit being lead to their associated devices through the tops of the tanks.

12. For use in apparatus of the class described, a valve comprising a casing, a shaft slidable in said casing, a valve disc on said shaft movable therewith to close or open a passage in said casing, a selector valve plug rotatable in said casing to connect an inlet opening with any one of a plurality of outlet openings in said casing, a lever in pivotal connection with said plug on an axis perpendicular to an axial plane of said shaft,

said lever being rotatable about the axis of said shaft to rotate said valve plug, and connections between said lever and shaft whereby said shaft is axially shiftable upon movement of said lever about said pivotal connection, a return spring for said shaft, and means operable to release said ing. a selector valve plug rotatable in said casing to' connect an inlet opening with any one of a plurality of outlet openings in said casing. a lever in pivotal connection with said plug onan axis p pendicular to an axial plane of said shaft. said lever being rotatable about the axis of said shaft to rotate. said valve plug, and connections between said lever and shaft whereby said shaft is axially shiftable upon movement of said lever about said pivotal connection. a return spring for said shaft. and means operable to release said last named connections whereby the shaft may be returned to seat said valve disc while'said lever remains in operated position, said last named means comprising a plunger slidable axially of said shaft.

- sition, a lever in pivotal connection with said plug on an axis perpendicular to an axial plane of said shaft. said lever being rotatable about the axis of said shaft to rotate said valve plug. and connections between said lever and shaft whereby said shait is axially shiiftable upon movement of said lever about said pivotal connection.

15. In a tank truck. a plurality oi tanks. a

Pump. connections between the tanks and the intake side of the pump. hydraulically controllable valves in said connections. a hydraulic motor for driving said pump, a source of fluid under pressure. and means for selectively associating said source with said hydraulically controllable valves and for associating said source with said motor. I

16. In a tank truck. a plurality of tanks. a pump. connections between the tanks and the intake side of the pump. hydraulically controllable valves in said connections. a hydraulic motor for driving said pump, a source of fluid under pressure, and means for selectively associating said source with said hydraulically controllable valves and for associating said source with said motor, said last named means comprising a shaft rotatable to a selecting position as regards said hydraulic'ally controllable valves and longitudinally displaceable to direct flow to said valves and motor.

17. In a tank truck. a plurality of tanks, a pump, connections between the tanks and the intake side of the pump, hydraulically controllable valves in said connections, a hydraulic motor for driving said pump. a source of fluid under pressure, and means for selectively associating said source with said hydraulically controllable valves and for associating said source with said motor,

said last named means comprising a shaft rotatable to a selecting position as regards said hydraulically controllable valves and longitudinally displaceable to direct flow simultaneously to said valves and motor.

18. For use in apparatus of the class described. a valve comprising a casing, a shaft slidable in said casing, a valve disc on said shaft movable therewith to close or open a passage in said casing. a selector. valve plug rotatable in said casing to connect an inlet opening with any one of a plurality of outlet openings in said casing, a lever in pivotal connection with said plug on an axis cases plane of and sum, about the axis of said plug. connections beperpendicular to an axial said lever being rotatable shaft to rotate said valve tween said lever and shaft axially shiftable upon movement of said lever about said pivotal connection. and -a guard provided with slots spaced as the various angular selecting positions of said plug with reference to said outlet openings and into which said lever is swingable to shift said shaft only when the plug is in one of said selecting positions.

19. An automotive vehicle truck having a tank thereon. of a pump and motor unit supported in said tank. means for conducting liquid to and from said motor. means ior connecting the pump to the interior andexterior of 'the tank. a pump exterior of said tank ior supplying fluid to said liquid conducting means. and means for driving said exterior pump from the engine of said truck.

20. An automotive vehicle truck having a tank thereon, of a pump and motor unit supported in said tank. means for conducting liquid to and from said motor. conducting means for connecting the pump to the interior and exterior of said tank. a pump exterior of said. tank for supplying fluidto the liquid conduction means 01' said motor. means for driving said pump from the engine of said truck, and a by-pass valvein the conducting means of the flrst said pump for shunting the liquid about the pump of the unit when the pressure of the liquid pumped thereby exceeds a predetermined amount.

21. The combination with an automobile truck having a tank thereon, having two liquid conducting circuits therein, a

motor and pump operatively connected and supported inside of said tank on said header to have a circuit connected to said motor and said pump, respectively. and means for supplying a fluid to said motor for eilecting the operation 01' said D p- 22. The combination with an automotive tank truck. of a pump. a n

uid circuit leading to and from said pump. a conduit by-passing said circuit across said pump. a pressure valve interconnecting said by-pass circuit to the circuit leading from the pump and opened when the pressure in the last-mentioned circuit exceeds a predetermined amount. a motor for a second pump of greater capacity than said motor for circulating a fluid through said motor and driving said motor at high speed, and a power take-oi! device connectible to the transmission of the truck for driving said second pump.

23. An automotive vehicle having a tank with a plurality of compartments thereon. a can-compartment in the rear of said tank, a motor and pump, a delivery conduit extending from said pump. a manifold connected to said pump and extending along said tank. intake conduits each having a valve therein connected to said manifold. means in said can-compartment for controlling the position of said valves. and a pump driven by the engine of the vehicle for supplying a fluid to said motor.

24. An automotive vehicle having a tank thereon divided into a plurality manifold on said tank interconnectible through valves to said compartments, a motor and pump unit, the pump of said unit being connected to the manifold, a delivery conduit connected to said pump, and a second pump of greater capacity than said motor driven by the vehicle engine for supplying fluid to said motor, and means for selectively connecting the pump of the unit wherebysaid shaft isdriving said pump,

of a header on said tank of compartments. a 

